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Effect of pressure on the number of dynamically correlated molecules when approaching the glass transition | | Christiane Alba-Simionesco
; Cecile Dalle-Ferrier
; Gilles Tarjus
; | | Date: |
11 Jan 2013 | | Abstract: | We characterize the heterogeneous character of the dynamics of liquids
approaching the glass transition through an experimental determination of the
number of dynamically correlated molecules N_{corr} as obtained from dynamical
susceptibilities. To do so, we have obtained a new set of dielectric
spectroscopy data for liquid dibutyl-phtalate on a fine and extended
temperature and pressure grid, and we have used it in conjunction with
high-pressure data from the literature. We have been able to evaluate the
contributions to N_{corr} that are due to fluctuations associated with density
and with temperature separately, thereby improving the estimate of N_{corr}. We
find that N_{corr} increases along the glass transition line, and more
generally along any isochronic line, as pressure increases (up to 1 GPa), a
result which is at odds with recent reports and theoretical predictions. | | Source: | arXiv, 1301.2451 | | Services: | Forum | Review | PDF | Favorites | |
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